Better graphics, gameplay, and a nice idea to choose enemies (who by the way are well balanced in areas). Its really tough to build momentum, and an eye for 4 in a row and anticipated moves/results of moved is definitely needed. Tread carefully in each turn, cowboy style will cost you!
Enemy AI is smart but you can learn anticipate their moves as you play, and you can find out ways to get around them, even set up 'traps'.
The end boss is easy, just 'throw the book' at him!
Sure its tougher, but it's a sequel, it has to be different! The smaller 'side games' are good, and delightfully frustrating in most cases! Enough to keep you coming back for more.
Perhaps a version from the perspective of the other side of the house?
 "Dark Legion 2"){kind=icon}
 "Dark Legion"){kind=icon}
 "Storm the House 3"){kind=icon}